Making the push operation costly, select the code snippet which implements the pop operation.

A.

public void pop()
{
        if(q1.size()>0)
        {
            q2.poll();
        }
        else if(q2.size()>0)
        {
            q1.poll();
        }
}

B.

public void pop()
{
        if(q1.size()>0)
        {
            q1.poll();
        }
        else if(q2.size()>0)
        {
            q2.poll();
        }
}

C.

public void pop()
{
        q1.poll();
	q2.poll();
}

D.

public void pop()
{
        if(q2.size()>0)
        {
            q1.poll();
        }
        else
        {
            q2.poll();
        }
}

Answer: Option B